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Universe Unit Vocab

Universe Unit Vocabu

TermDefinition
Gravity the force that governs the universe and keeps celestial objects in orbit.
Planet a celestial body that orbits a star
Star a hot ball of gas that emits light through the process of nuclear fusion
Solar System a collection of celestial objects that orbit a star
Nebula a large collection of gas and dust that is known as the birthplace of stars
Galaxy a giant structure that contains gas, dust, and a vast number of stars
Universe includes all matter and energy
Luminosity The brightness of a celestial object
Spectral class the classification of stars based on their temperatures
Hertzsprung-Russell (H-R) Diagram is used to chart the life cycles of stars
Created by: Mrs. Jackie
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